Unexpected symbol `[' in class, struct, or interface member declaration

I’ve tried converting this dynamic Skybox example here

to C#.
but keep getting the following compile error
Unexpected symbol `[’ in class, struct, or interface member declaration

My code is

using UnityEngine;
using System.Collections;

public class LoadSkyBox : MonoBehaviour {

	private static String[] skyboxTextures  = ["_FrontTex", "_BackTex", "_LeftTex", "_RightTex", "_UpTex", "_DownTex"];
 private String url = "/Assets/Resources/";
 
 void LoadImg (String skyboxName){
     WWW[] www    =  new WWW[6];
     for (int i = 0;i < 6; i++)
     {
         www _= new WWW(url + skyboxName + skyboxTextures *+ ".png");*_

}
Material mat = GetComponent().material;
for (i = 0;i < 6; i++)
{
// wait until the download is done
yield return www;
mat.SetTexture(skyboxTextures_,www*.texture);
}
}*_

void Start () {
LoadImg(“beach”);
// Images should be named:
// “beach_FrontTex.png”
// “beach_BackTex.png”
// …
}
}

This line uses the wrong sysntax for declaring an array:

   private static String[] skyboxTextures  = ["_FrontTex", "_BackTex", "_LeftTex", "_RightTex", "_UpTex", "_DownTex"];

It has to be written like this:

private static String[] skyboxTextures  = new  String[] {"_FrontTex", "_BackTex", "_LeftTex", "_RightTex", "_UpTex", "_DownTex"};